I've put in pretty much every spare hour that I've had for the past two weeks trying to get a grip on the issues involved in running gearmotor/rotary encoder ensembles at high accuracy. For a long time now I've been able to accurately extrude relatively long, straight lines of polymer at good accuracy and repeatability. Currently, with the gearmotors that I am using I can get a top diagonal extrusion speed in the xy working plane of about 2.4 mm/sec.
What I haven't been able to do well is to print a sequence of very short line segments (~0.1 mm) rendered as a series of print instructions on Tommelise. For this reason, I can make things like polymer pumps, but am totally pants at making features like holes in said pumps.
(Read the full story)